The hand definitely isn't folded. I don't believe it constitutes an automatic call either though.
Poker TDA Rule 12 says:
12. No Disclosure
Players are obligated to protect the other players in the tournament at all times. Therefore, players, whether in the hand or not, may not:
1. Disclose contents of live or folded hands
2. Advise or criticize play before the action is complete
3. Read a hand that hasn’t been tabled
The one-player-to-a-hand rule will be enforced.
And Rule 31 says:
31. Exposing Cards
A player who exposes his cards with action pending may incur a penalty, but will not have a dead hand. The penalty will begin at the end of the hand.
That means you're not
supposed to show the hand and you can be subject to a penalty. But any penalty only takes effect
after the hand is over and your hand isn't dead - you can still act on it however you see fit.
Of course, if the tournament doesn't follow the TDA rules then all bets are off. It's entirely possible some tournaments have house rules that mean exposed cards are automatically folded. It'd be a crap rule, but that doesn't mean it's not valid for that tournament.